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Unanswered Questions

9
votes
1answer
1k views

Is it possible in FFMPEG to change scale over time?

Ok, so using the overlay filter, one can change the x/y location of a video over time by using the "t" variable. For example, overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0 can be used to start ...
7
votes
2answers
91 views

One long continuous shot, sped-up until it becomes “live”

I have an idea for a video project (that I will need to commission a studio to produce for me), but at this early stage I don't even know whether my idea is feasible. The idea involves turning (hours ...
7
votes
1answer
2k views

How to capture DVB-T using a generic RTL2832U USB stick on a mac

Is there a way to capture DVB-T video using a generic USB DVB-T dongle on a mac? I've read many examples of people using VLC on Linux/PCs, but can't see any generic drivers on Mac OSX?
6
votes
0answers
2k views

How to produce a zoom animation of a video source with ffmpeg?

I'd like to create a zoom-in animation over numerous frames of a video clip. I've tried a couple of approaches without much luck. ffmpeg -i test-10s.mp4 -vf "zoompan=z='zoom+0.001'" zoompan-10s.mp4 ...
6
votes
1answer
537 views

Making a Digital clock with a specific time for Sony Vegas Platinum 12

I'm using Vegas Platinum 12 and I want to create a time code in a video. But here is the catch. I want to start the clock at a specific time and have the count start at that time, i.e 05:21:34 or 21:...
6
votes
2answers
1k views

Simple editing without re-encoding from the GoPro AVC codec?

Im looking for a fast workflow, where i can take my gopro video files, make simple cuts (no transisions, no effects, no audio manipulation), and cut them together into a clip and then export that edit ...
5
votes
5answers
659 views

Most-efficient inexpensive way to speed/slow video track to sync with audio track?

My machines are a few Android tablets (not the newest, but not too old either) as well as a Mac running OS X 10.9.5 (not about to upgrade the OS - long and irrelevant story why). Sometimes I do a ...
4
votes
1answer
68 views

How to detect whether a video is shaky

I need to stabilize a video only when the video is shaky , I have succesfully stabilized a video using ffmpeg and I do not need to stabilize all the videos , I only need to stabilize the videos which ...
4
votes
2answers
49 views

How can I mark or tag spots in a video clip during a live recording

A couple of years ago I reacll seeing something on a crowd funding platform. It was a way to 'tag' or 'mark' a portion of a video during live recording. i.e. if you just had a sports play that you ...
4
votes
2answers
66 views

How do I create a random word title?

I really don't know what is the best way to phrase this. But basically what I want is to have a single word on the screen, e.g. AUGUST. So when the title first starts, all 6 letters will be ...
4
votes
2answers
71 views

Easily replace clips in Premiere Pro

I have a couple hundred video clips in a premiere pro project (uncompressed avi), and it is burning too much space on my hard disk. I want to compress these clips (perhaps to x264). Is there an easy ...
4
votes
1answer
86 views

How do I apply effects to a layer at its current resolution (scaled up by the layer's scale property) instead of its original resolution?

I'm a sprite animator in Adobe After Effects. For example, I want to be able to skew a layer, but because this image is very small on its own, when I scale up its scale property and then skew it ...
4
votes
0answers
295 views

GStreamer mpegtsmux produces empty output file

I'm trying to construct a GStreamer pipeline to transcode MPEG2 video and MPEG1 audio in a MPEGTS container to H.264 and AAC and output to a filesink. The problem is: the output file is empty. If I ...
4
votes
0answers
2k views

Using ffmpeg to cut videos with more precision than key frames allow

I'm trying to cut a video (a debate on TV) with ffmpeg without re-encoding, and I need to cut between 2 sentences a guy pronounce. I think the precise moment is between two keyframes, because whatever ...
4
votes
0answers
1k views

Getting FFMPEG to stream video+audio through RTMP

Can someone help me with this : The video streams fine but I can't hear any audio. I just hear random click sounds.Please help : ffmpeg -f video4linux2 -channel 1 -i /dev/video0 -f alsa -i plughw:...

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